Police said Clark was an MRI technician at Southern Tier Imaging where the shooting took place outside. Police say he had worked there for at least five years.

Police Chief Joseph Zikuski says Clark prevented other employees from entering the building Monday morning, telling them there were bombs inside.

Zikuski said Clark didn't have a history of mental illness and he did not have a criminal history except one DUI several years ago.

Clark is accused of shooting Johnson City police officer Dave Smith, who was responding to a disturbance just outside of Southern Imaging at 32 Harrison St.

Police said Clark shot Smith two times and then fired on responding officers, who then shot him.

Clark later died in surgery.

Zikuski said employees saw Clark as a hard worker.

"We're being told he's a model employee, no problems, no indication that they would no he was capable of the behavior he demonstrated," Zikuski said. "That's what's puzzling, there's no mental history at this point."

Clark's neighbor Kathy Kellogg in the village of Greene said he was the most outgoing and approachable on the block.

"They've been our neighbors for seven years, and they've been the best neighbors you can ask for," she said. "And Jim, you couldn't ask for a better neighbor, friendly, social, wonderful."